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STOCKHOLDERS' EQUITY: - Directors Stock Award Plan (Details) - shares
 9 Months Ended
May 27, 2022
Apr. 26, 2018
Apr. 25, 2018
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Parent Company (Grupo Mexico)            
Activity in directors' stock award plan            
Treasury stock balance at the end of the period (in shares)       67,798,524   79,728,356
Directors' Stock Award Plan            
Share based Compensation Plan            
Common shares received on election as director       1,200    
Additional shares issued at each annual general meeting     1,200 1,200    
Total SCC shares reserved for the plan       600,000 600,000  
Period of extension of plan 5 years 5 years        
Increased share awards issued to directors   1,600        
Numbers of shares shall be granted quarterly and conditioned upon the attendance of each director to each Board meeting       1,600    
Activity in directors' stock award plan            
Total shares granted at the beginning of the period (in shares)       (416,800) (405,200)  
Granted (in shares)       (9,600) (8,800)  
Total shares granted at the end of the period (in shares)       (426,400) (414,000)  
Remaining shares reserved       173,600 186,000